Hold the skimmer face plate against the above-ground pool's sidewall. Poke a hole in the sidewall through the face plate's corner screw holes with a utility knife.
Place one supplied screw through each of the face plate's corner screw holes. Position the face plate against the pool wall on the inside, pushing the screws through the holes you poked in the sidewall.
Put the supplied gasket around the skimmer. Line up the skimmer's screw holes with the screws protruding through the pool's sidewall. Tighten the screws with a Phillips screwdriver, just enough to hold the skimmer in place. Poke holes through the face plate's bottom two corner screw holes. Fit a supplied screw through each screw hole and partially tighten them.
Check the skimmer's gasket and adjust as needed. Finish installing the remaining supplied screws and tighten all the screws to hold the skimmer in place.
Remove the piece of sidewall covering the skimmer's opening from inside the pool with a utility knife. Use the face plate as a straight edge.
Line up the skimmer basket's lip with the mounting tabs on the face plate. Lower the basket until it hooks onto the tabs.